South Africa beat the United Arab Emirates by six wickets in New Delhi, chasing down a victory target of 123 with 40 balls to spare, to finish the group stage of cricket's Twenty20 World Cup unbeaten. South Africa opted to field first on Wednesday and restricted the UAE to 122-6, with veteran pace bowlers Corbin Bosch returning 3-12 from four overs and Anrich Nortje taking 2-28.